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Thanks Jacky,
Just Googled microns to metric and inches converters
500 micron=0.5mm=1/64" inch. So I'll take it from there
Thanks again for your help
Hi there Walrus! Don't know about microns, but get best quality you can afford and UV stabilised for outdoor use. Even the best plastic ones only last a few years. My old large greenhouse was plastic covered because of safety concerns- it was on a main path. My better half always regretted not getting better sheeting he says. Even so, fifteen years ago it cost about £200 so plastic is pricey.
Still a ton cheaper than the equivalent large glass house!